Update to MC 1.12-pre2

Spigot-Server-Patches/Prevent-Pathfinding-out-of-World-Border.patch

@@ -6,13 +6,13 @@ Subject: [PATCH] Prevent Pathfinding out of World Border
 This prevents Entities from trying to run outside of the World Border
 
 diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
-index c0ef2400b..74d1fd6b2 100644
+index 3871ad017..a67cc3b75 100644
 --- a/src/main/java/net/minecraft/server/NavigationAbstract.java
 +++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
 @@ -0,0 +0,0 @@ public abstract class NavigationAbstract {
  
      @Nullable
-     public PathEntity a(BlockPosition blockposition) {
+     public PathEntity b(BlockPosition blockposition) {
 +        if (!getEntity().getWorld().getWorldBorder().isInBounds(blockposition)) return null; // Paper - don't path out of world border
          if (!this.b()) {
              return null;